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Observations of Rotationally Resolved C_3 in Translucent Sight Lines

Ádámkovics, Máté and Blake, Geoffrey A. and McCall, Benjamin J. (2003) Observations of Rotationally Resolved C_3 in Translucent Sight Lines. Astrophysical Journal, 595 (1). pp. 235-246. ISSN 0004-637X. doi:10.1086/377305.

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The rotationally resolved spectrum of the A^1Π_u ← X^1Σ^+_g 000-000 transition of C_3, centered at 4051.6 Å, has been observed along 10 translucent lines of sight. To interpret these spectra, a new method for the determination of column densities and analysis of excitation profiles involving the simulation and fitting of observed spectra has been developed. The populations of lower rotational levels (J ≤ 14) in C_3 are best fitted by thermal distributions that are consistent with the kinetic temperatures determined from the excitation profile of C_2. Just as in the case of C_2, higher rotational levels (J > 14) of C_3 show increased nonthermal population distributions in clouds that have been determined to have total gas densities below ~500 cm^(-3).

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Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2003 American Astronomical Society. Received 2003 April 30; accepted 2003 June 3. We thank the referee, J. H. Black, for helpful suggestions that have improved the manuscript. We also wish to acknowledge helpful conversations with L. M. Hobbs, T. Oka, T. P. Snow, J. A. Thorburn, D. E. Welty, and D. G. York. The data presented herein were obtained at the W. M. Keck Observatory and the University of California Observatories/Lick Observatory. The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration and was made possible by the generous financial support of the W.M. Keck Foundation. B. J. M. is supported by the Miller Institute for Basic Research in Science.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Miller Institute for Basic Research in ScienceUNSPECIFIED
Subject Keywords: astrochemistry; ISM: lines and bands; ISM: molecules
Issue or Number:1
Record Number:CaltechAUTHORS:20120918-133446046
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Official Citation: Observations of Rotationally Resolved C3 in Translucent Sight Lines Máté Ádámkovics et al. 2003 ApJ 595 235
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34184
Deposited By: Ruth Sustaita
Deposited On:18 Sep 2012 20:55
Last Modified:09 Nov 2021 23:07

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